UPDATED May 13, 2006 Treehouses have a magical quality that sparks the imagination of children and returns adults to long lost afternoons filled with secret adventures. However, few of the corrugated iron structures we cobbled together as kids could approach the impressive scale and fairytale qualities found in PearTree Treehouse designs. Individually tailored to each customer's requirements no matter their age, PearTree projects include two storey adult treehouses, home offices and even 30 seater conference suites. Extensive image library here.